I'd assume insufficient z offset but some areas of the first layer look fine. I've been struggling with this problem despite lots of attempts including z offset, infill overlap, belt retensioning, etc.
Anyone else experienced this type of issue and have suggestions to fix it properly?
I'm using polylite PLA and a E3D steel nozzle. 60 °C bed temp, 230 °C first layer.
Edit: Print speed is 30 mm/s first layer, 60 mm/s normal. This issue occurs on the first few layers then the rest get increasingly better, with the final layer being excellent.
Edit2: Despite lowering the temp to 205--210 and increasing the z offset downwards, the problem persists, though to a lesser degree. Just gaps at ends of infill lines and between straight and circular walls. But seems it only occurs on the lower left and upper right (birds eye view) of the print.
Edit3: The lower left and upper right being further from the nozzle coincides with my removal process using the knife on the lower left and upper right.. Maybe this part of the problem I'll have to bend back in place?
Nozzle bed measurements below:
Edit4: Optimizing the Z offset according to the first layer thickness remained only a partial solution especially as my bed unevenness (1mm+) was past the auto-leveling limitations (<0.5mm), but I found a great thread (link below) with a "correct" solution that worked for a lot of people! After I try this I will come back and write about my experience with the solution.